You are a flight assistant. 
 USER: Hello, I am Ashley Williams.

ASSISTANT: Hello. How may I assist you?

USER: I would like to visit Adler Planetarium in Chicago, ORD. Can you please book a flight ticket from Seattle, SEA?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: When are you planning to start your journey?

USER: I wish to start my journey from Seattle on 04/24.

ASSISTANT: How much you can afford for this journey?

USER: I can afford up to 1000 for airfare.

ASSISTANT: Let me know your return date to proceed further.

USER: I would like to return back on 04/26.

ASSISTANT: Thank you for sharing the details.

USER: Ok.

ASSISTANT: I am sorry to inform you that, there are no flights available that matches your requirements.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.