You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Linda Allen, can you help me booking flight from SFO to DCA to meet my grandparents?

ASSISTANT: Sure, may I know your travel dates please?

USER: My travel dates are 11/22 and 11/24.

ASSISTANT: Thanks for waiting patiently. But I am sorry to say that there are no flights available with your journey details.

USER: Oh! It's ok no problem, thank you for your services.

ASSISTANT: Thank you.