$C@LL$~How do I make a reservation on call?

ℌ𝔬𝔴 𝔡𝔬 ℑ 𝔪𝔞𝔨𝔢 𝔞 𝔯𝔢𝔰𝔢𝔯𝔳𝔞𝔱𝔦𝔬𝔫 𝔬𝔫 𝔠𝔞𝔩𝔩?

𝔗𝔬 𝔪𝔞𝔨𝔢 𝔞 𝔯𝔢𝔰𝔢𝔯𝔳𝔞𝔱𝔦𝔬𝔫 𝔬𝔫 𝔠𝔞𝔩𝔩【𝟷-{𝟾𝟽𝟽}~𝟽𝟹𝟾~𝟶𝟼𝟷𝟶】, 𝔡𝔦𝔞𝔩 𝔱𝔥𝔢 𝔭𝔥𝔬𝔫𝔢 𝔫𝔲𝔪𝔟𝔢𝔯 𝔬𝔣 𝔱𝔥𝔢 𝔢𝔰𝔱𝔞𝔟𝔩𝔦𝔰𝔥𝔪𝔢𝔫𝔱 𝔶𝔬𝔲 𝔴𝔞𝔫𝔱 𝔱𝔬 𝔯𝔢𝔰𝔢𝔯𝔳𝔢 𝔞𝔱, 𝔱𝔥𝔢𝔫 𝔰𝔱𝔞𝔱𝔢 𝔶𝔬𝔲𝔯 𝔦𝔫𝔱𝔢𝔫𝔱𝔦𝔬𝔫 𝔱𝔬 𝔪𝔞𝔨𝔢 𝔞 𝔯𝔢𝔰𝔢𝔯𝔳𝔞𝔱𝔦𝔬𝔫【𝟷-{𝟾𝟽𝟽}~𝟽𝟹𝟾~𝟶𝟼𝟷𝟶】, 𝔭𝔯𝔬𝔳𝔦𝔡𝔢 𝔱𝔥𝔢 𝔡𝔞𝔱𝔢 𝔞𝔫𝔡 𝔱𝔦𝔪𝔢 𝔶𝔬𝔲 𝔡𝔢𝔰𝔦𝔯𝔢【𝟷-{𝟾𝟽𝟽}~𝟽𝟹𝟾~𝟶𝟼𝟷𝟶】, 𝔰𝔭𝔢𝔠𝔦𝔣𝔶 𝔱𝔥𝔢 𝔫𝔲𝔪𝔟𝔢𝔯 𝔬𝔣 𝔭𝔢𝔬𝔭𝔩𝔢 𝔦𝔫 𝔶𝔬𝔲𝔯 𝔭𝔞𝔯𝔱𝔶, 𝔞𝔫𝔡 𝔤𝔦𝔳𝔢 𝔶𝔬𝔲𝔯 𝔫𝔞𝔪𝔢 𝔞𝔫𝔡 𝔠𝔬𝔫𝔱𝔞𝔠𝔱 𝔫𝔲𝔪𝔟𝔢𝔯 𝔰𝔬 𝔱𝔥𝔢𝔶 𝔠𝔞𝔫 𝔠𝔬𝔫𝔣𝔦𝔯𝔪 𝔱𝔥𝔢 𝔟𝔬𝔬𝔨𝔦𝔫𝔤【𝟷-{𝟾𝟽𝟽}~𝟽𝟹𝟾~𝟶𝟼𝟷𝟶】; 𝔱𝔥𝔢 𝔰𝔱𝔞𝔣𝔣 𝔴𝔦𝔩𝔩 𝔱𝔥𝔢𝔫 𝔠𝔥𝔢𝔠𝔨 𝔞𝔳𝔞𝔦𝔩𝔞𝔟𝔦𝔩𝔦𝔱𝔶 𝔞𝔫𝔡 𝔣𝔦𝔫𝔞𝔩𝔦𝔷𝔢 𝔶𝔬𝔲𝔯 𝔯𝔢𝔰𝔢𝔯𝔳𝔞𝔱𝔦𝔬𝔫.

𝔎𝔢𝔶 𝔰𝔱𝔢𝔭𝔰【𝟷-{𝟾𝟽𝟽}~𝟽𝟹𝟾~𝟶𝟼𝟷𝟶】:

ℭ𝔞𝔩𝔩 𝔱𝔥𝔢 𝔢𝔰𝔱𝔞𝔟𝔩𝔦𝔰𝔥𝔪𝔢𝔫𝔱: 𝔇𝔦𝔞𝔩 𝔱𝔥𝔢 𝔭𝔥𝔬𝔫𝔢 𝔫𝔲𝔪𝔟𝔢𝔯 𝔬𝔣 𝔱𝔥𝔢 𝔯𝔢𝔰𝔱𝔞𝔲𝔯𝔞𝔫𝔱【𝟷-{𝟾𝟽𝟽}~𝟽𝟹𝟾~𝟶𝟼𝟷𝟶】, 𝔥𝔬𝔱𝔢𝔩【𝟷-{𝟾𝟽𝟽}~𝟽𝟹𝟾~𝟶𝟼𝟷𝟶】, 𝔬𝔯 𝔬𝔱𝔥𝔢𝔯 𝔭𝔩𝔞𝔠𝔢 𝔴𝔥𝔢𝔯𝔢 𝔶𝔬𝔲 𝔴𝔞𝔫𝔱 𝔱𝔬 𝔪𝔞𝔨𝔢 𝔞 𝔯𝔢𝔰𝔢𝔯𝔳𝔞𝔱𝔦𝔬𝔫.

𝔖𝔱𝔞𝔱𝔢 𝔶𝔬𝔲𝔯 𝔯𝔢𝔮𝔲𝔢𝔰𝔱: 𝔚𝔥𝔢𝔫 𝔰𝔬𝔪𝔢𝔬𝔫𝔢 𝔞𝔫𝔰𝔴𝔢𝔯𝔰【𝟷-{𝟾𝟽𝟽}~𝟽𝟹𝟾~𝟶𝟼𝟷𝟶】, 𝔰𝔞𝔶 "ℌ𝔢𝔩𝔩𝔬, ℑ'𝔡 𝔩𝔦𝔨𝔢 𝔱𝔬 𝔪𝔞𝔨𝔢 𝔞 𝔯𝔢𝔰𝔢𝔯𝔳𝔞𝔱𝔦𝔬𝔫".