You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I guide you today?

USER: I have to attend a business meeting in Seattle on 07/25, can you please book a flight ticket from Washington on 07/24?

ASSISTANT: Sure, I will help you with that.

USER: Thanks.

ASSISTANT: May I know your airport codes to proceed further?

USER: My departure airport is IAD and destination airport is SEA.

ASSISTANT: May I know your return date please?

USER: Yes, please book my return ticket also on 07/26.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: I am sorry to say that there is no flight found. May I know your name?

USER: It's ok no problem, I will go with another airline. Sure, my name is Michael Wilson.

ASSISTANT: Thank you for contacting us.

USER: Thank you for your information.