You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you help me in booking a flight ticket from SFO to IAD?

ASSISTANT: Yes, can you tell me your dates of travel?

USER: I want to travel on 09/01, and return on 09/03.

ASSISTANT: Do you have any other preferences?

USER: I want to return in the afternoon time.

ASSISTANT: Give me a moment.

USER: Sure.

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

USER: Ok, no issues.

ASSISTANT: Can I know your name?

USER: I am Frank Thompson.

ASSISTANT: Thank you for contacting us.

USER: Thanks for the information.