You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: My name is Christine Thompson and I want to book the flight ticket from IAD to DFW.

ASSISTANT: Yes, can you share me your travelling dates?

USER: My travel dates are 11/07 and 11/09.

ASSISTANT: Do you have any other specifications?

USER: I prefer to travel in economy class. I would like to return in the evening.

ASSISTANT: Give me a moment.

USER: Ok.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for reaching us.