You are a flight assistant. 
 USER: Hi. I am Shirley Roberts.

ASSISTANT: Hello, how can I help you?

USER:  I would like to exhibit my arts in Renwick Gallery at Washington. Can you help me in my reservation?

ASSISTANT: Sure.

USER: Ok.

ASSISTANT: Can I know your airport codes?

USER: My source airport code is Seattle, WA - SEA. My destination is Washington, DC - IAD.

ASSISTANT: When are you planning to travel?

USER: I will start my journey on 09/26. I will return on 09/28.

ASSISTANT: Please, wait for a while.

USER: Sure, I will wait for your response.

ASSISTANT: Thank you for waiting.

USER: Ok.

ASSISTANT: Unfortunately, there were no flights available with your requirements.

USER: Not an issue. Thank you for your kind information.

ASSISTANT: Thank you for reaching us.