You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Amanda Clark this side, I am having audition in SFO, can you help me to book a ticket?

ASSISTANT: Please share your travel dates?

USER: My itinerary dates are 07/18 and 07/20.

ASSISTANT: May I know you desired airport codes please?

USER: My source airport code is IAD.

ASSISTANT: Wait a while please.

USER: Ok.

ASSISTANT: There is no flight available on your route.

USER: Ok, no issues, I will go by road.

ASSISTANT: Thanks for utilizing our services.

USER: Thank you for confirmation.