You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: I am planning to visit Philadelphia, PHL to attend a client meeting. Could you please help me in booking the flight ticket from Houston, IAH?

ASSISTANT: I understand your request and will be happy to help you.Certainly, could you pleases share your departure and arrival day?

USER: I am planning to depart on 02/29 and would like to return on 03/02.

ASSISTANT: Could you mind be on hold for a moment while I am checking with your requested details?

USER: Sure, I will wait for your response.

ASSISTANT: Ok, may I know your good name please?

USER: My name is Benjamin Thomas.

ASSISTANT: Sorry, all flight tickets are sold out on your requested travelling dates.

USER: Ok, not an issue. I will find any other alternate for this trip. Anyways, thank you for your quick response.

ASSISTANT: My pleasure. If any questions arise, please feel free to contact us at any time.