You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I guide you today?

USER: I am Raymond Lewis. Can you find a flight from SFO to DCA, to attend a marriage of my friend.

ASSISTANT: Sure, I will help you with that. Can you please share your journey dates?

USER: Sure, my travelling dates are 03/07 and 03/09.

ASSISTANT: Please wait for a minute.

USER: Ok.

ASSISTANT: I am sorry to say that there is no flight found.

USER: It's ok, thanks for your information.

ASSISTANT: Thank you for reaching us.