You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Edward Rodriguez.

ASSISTANT: How may I assist you today?

USER: I want to visit Navajo Adventure at San Francisco, can you please book me a ticket?

ASSISTANT: Sure, I am glad to help you. Can you please provide your planned dates of travelling?

USER: My trip dates are 04/22 to 04/24.

ASSISTANT: Ok, may I know your origin and destination airport codes for booking?

USER: My source is ORD and destination is SFO.

ASSISTANT: Please wait a moment to check the flights availability.

USER: Sure.

ASSISTANT: Sorry to inform you that, there are no flights moving to your region with planned dates of travelling.

USER: No issue, thank you.

ASSISTANT: Thank you for approaching us, have a great day.