You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me out with booking of a flight ticket from IAH to PHL?

ASSISTANT: Sure, when do you want to travel?

USER: Thank you for taking my request into consideration, I am planning to move on Dec 09 and please book my return ticket on Dec 11.

ASSISTANT: Ok, Do you have any class preference?

USER: No.

ASSISTANT: Ok, Kindly mention your connection limit.

USER: Sure, I will prefer single connection.

ASSISTANT: Ok, Do you have any other preferences?

USER: No.

ASSISTANT: Ok, please wait for a moment.

USER: Sure, take your time.

ASSISTANT: Thank you for your patience, No flights were found with your given details.

USER: Oh! Sad to hear that. Anyway, I will find another alternative. Thank you for the information.

ASSISTANT: Ok, May I know your name?

USER: Sure, my name is Joseph Martin.

ASSISTANT: Thank you for choosing us.

USER: You are welcome.