You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Christopher Smith.

ASSISTANT: How may I aid you?

USER: Can you please help me in booking a flight ticket from LAX to PHL locations?

ASSISTANT: Sure, may I know your preferable dates of journey?

USER: My travelling dates are from 12/20 and 12/22.

ASSISTANT: Smith, no flights has been found on your requested dates.

USER: It's ok. Thank you for the information.

ASSISTANT: Thank you for approaching us.