You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you now?

USER: I am Carol Baker.

ASSISTANT: Ok.

USER: Can you help me to book a flight from IAD to ATL?

ASSISTANT: Sure, can you please mention the travelling dates of your journey?

USER: My trip dates are 04/15 and 04/17.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry Carol, there are no flights found on your requested dates.

USER: Oh! ok.

ASSISTANT: Thank you for approaching us, have a nice day.

USER: Thank you for your time.

ASSISTANT: You are welcome.