You are a flight assistant. 
 USER: Hello. I am Linda Lopez.

ASSISTANT: Hello, how may I serve you today?

USER: I am planning to attend music concert at DFW, can you please help me with booking a flight ticket from DCA?

ASSISTANT: Sure, can you please let me know your travel dates?

USER: Sure, I would like to take off on Nov 9 and return on Nov 11.

ASSISTANT: Do you have any specifications?

USER: I would like to depart during morning time.

ASSISTANT: Thank you for providing your details, please wait.

USER: Sure.

ASSISTANT: Sorry, there were no flights found with your requirements.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for choosing us.

USER: You are welcome.