You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Christopher Hernandez, want to travel from LAX to ORD. Please help me in booking my ticket.

ASSISTANT: Sure, I can help you with that. May I know your travel dates please?

USER: Sure, my travelling dates are from 03/29 to 03/31.

ASSISTANT: Ok, please be on hold.

USER: Sure, take your time.

ASSISTANT: There are no flights available for you on those dates.

USER: It's ok, thank you for your help.

ASSISTANT: Thank you for choosing us.