You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Barbara Anderson.

ASSISTANT: How may I guide you?

USER: I would like to take a flight from IAH to PHL, hope you are helping me out.

ASSISTANT: Sure, I will assist you in that airline ticket booking. Could you please help me out in providing your trip dates?

USER: Sure, my travelling dates are 04/30 and 05/02.

ASSISTANT: Please wait for a while to search for the flight and I will provide you the details.

USER: Ok, take your time.

ASSISTANT: Thank you for your patience, there are no flights that are moving on the dates that you have provided due to sold out of tickets.

USER: It's ok, thanks for your information.

ASSISTANT: You are most welcome.