You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you please help me in booking a flight ticket from PHX to LGA?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: I would like to fly on Apr 15 and return on Apr 17.

ASSISTANT: Do you have any other specifications?

USER: Yes, I would like to depart in evening time.

ASSISTANT: May I know your name please?

USER: I am Larry Johnson.

ASSISTANT: Sorry for this inconvenience, I could not find any flight with your requirements.

USER: Not an issue. Thank you for your help.

ASSISTANT: Thank you for reaching us.