You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Please help me out in booking the ticket from HOU to DEN.

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

USER: My trip dates will be May 31 to Jun 2.

ASSISTANT: Do you have any other specifications?

USER: I need a connecting flight and depart time must be in the evening.

ASSISTANT: Please help me with your name for booking.

USER: Jonathan Mitchell is my name.

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

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.