You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,  what kind of service you are looking from our side?

USER: There is relatives get together in Phoenix for this christmas. So my family is planning to travel from HOU to PHX, can you help me booking a ticket?

ASSISTANT: Oh nice to hear this. On which dates your get together held?

USER: My travel dates are 05/29 and return on 05/31.

ASSISTANT: Ok. Give a minute please.

USER: Ok.

ASSISTANT: Sorry to say, but there is no flight available. May I know your name?

USER: It's fine, thanks for your help. My name is Timothy Mitchell.

ASSISTANT: Thank you .