You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Richard Taylor.

ASSISTANT: Nice to meet you Richard.

USER: I would like to book a ticket from IAD to ATL, can you please help me out?

ASSISTANT: Sure, tell me your travel dates please?

USER: I am travelling on these dates September 18th and 20th.

ASSISTANT: Do you have any preferences?

USER: I prefer departure in the morning.

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

USER: Ok no problem, thank you for your services.

ASSISTANT: Thank you.