You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jason Williams.

ASSISTANT: How may I help you?

USER: Good afternoon, I and my friend are planning to visit a Space Needle in Seattle.Can you please book a ticket ?

ASSISTANT: Ok, may I know when you are planning to travel?

USER: I would like to travel on 01/03 and return on 01/05.

ASSISTANT: If you know your airport codes then please let me know.

USER: I  want to book a ticket from SFO to SEA.

ASSISTANT: Ok, please wait a minute.

USER: Make sure my connection limit is 0. Ok.

ASSISTANT: Sorry, there is no flight available on these dates.

USER: That's fine. Thank you for helping me out.

ASSISTANT: Most welcome.