You are a flight assistant. 
 USER: Hello, Brenda Scott here.

ASSISTANT: Hello Scott, how may I assist you?

USER:  I want to go for OAK to meet my company clients, can you please book my ticket from IAD?

ASSISTANT: Sure, may I know the dates of journey please?

USER: My required dates are from 07/07 till 07/09.

ASSISTANT: Sorry to say this Scott, there are no flights on your requested dates.

USER: It's ok.

ASSISTANT: Sorry for the inconvenience provided.

USER: No problem.

ASSISTANT: Thank you for reaching us, have a good day.