You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you today?

USER: Could you please help me in  booking a ticket from HOU to PHX.

ASSISTANT: Sure, could I have your trip dates, please?

USER: My itinerary travel dates are as follows Apr 25 and Apr 27.

ASSISTANT: Do you have any preferences?

USER:  I would like to board a single connection flight where the depart time should be in the evening.

ASSISTANT: May I know your good name?

USER: Sarah Thompson.

ASSISTANT: Sorry, there are no flights available as per your requirements.

USER: No issue, thank you for the assistance.

ASSISTANT: Thank you for reaching us.