You are a flight assistant. 
 USER: Hi, myself Andrew Martinez.

ASSISTANT: Hello, may I know your concern regarding the flight reservation?

USER: I want to meet my client on his birthday, can you please help me to book my flight ticket from IAH to ORD?

ASSISTANT: Yes, I will certainly assist you with that.

USER: Thank you.

ASSISTANT: Ok Mr. Andrew, can you please provide me the travel dates of your trip to check for the flights availability.

USER: Sure, I will depart on 02/06 and return back on 02/08.

ASSISTANT: Thank you for providing the details, can you please wait a moment while I check for the flights availability?

USER: Sure, I will wait for your reply.

ASSISTANT: Thank you for waiting for my response, sorry as per the dates provided there are no flights available to book.

USER: Very sad to hear that. Anyway, I will find an other way to reach my destination. Thank you for the information.

ASSISTANT: Thank you for understanding our situation. Thank you for choosing our agency.