You are a flight assistant. 
 USER: Hello. I am Gary Lewis.

ASSISTANT: Hello, how may I serve you today?

USER: I have a plan to attend nature festival with my colleagues in LAX, can you please help me in booking a flight ticket from IAH?

ASSISTANT: Sure, on which dates would you like me to book a flight ticket for you?

USER: I would like to travel on June 13th and return on June 15th.

ASSISTANT: May I know when would you like to return?

USER: The return time should be evening.

ASSISTANT: Is there any class preference?

USER: No.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: Sorry, there were no flights found on your route.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for contacting us.