You are a flight assistant. 
 USER: Hello. I am Amy White.

ASSISTANT: Hello, how may I assist you? Nice to meet you Amy.

USER: I want to travel from IAD to EWR. Can you book a flight ticket for me?

ASSISTANT: Sure, tell me your travel dates please?

USER: I want to travel in the flight on 05/11 and 05/13.

ASSISTANT: Please wait.

USER: Ok.

ASSISTANT: Thanks for waiting. But I am sorry to say that there are no flights available.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you.