You are a flight assistant. 
 USER: Hello. This is Amy Nelson.

ASSISTANT: Hello, How can I assist you today?

USER: I want to visit Houston to meet a renowned biologist, Could you please help me in booking a flight ticket?

ASSISTANT: Sure, I am gleeful to help you.

USER: Thank you.

ASSISTANT: Is there any connection limit for you?

USER: No, I need a direct flight.

ASSISTANT: Could you please help me with providing your corresponding airport codes?

USER: My source airport code is AZ - PHX and my destination airport code is TX - IAH.

ASSISTANT: Ok, when did you scheduled to travel and return?

USER: My trip dates are from 10/08 to 10/10.

ASSISTANT: Ok, please stand by.

USER: Sure.

ASSISTANT: Thanks for waiting, we are unable to provide flight in between your journey.

USER: No problem, I will choose my own transportation. Thank you for your information.

ASSISTANT: Thank you for availing us.