You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Catherine Martin.

ASSISTANT: How can I help you today?

USER: I want to attend a music event in Washington, where my favourite band will be performing. Can you help me to book a ticket from SEA to IAD?

ASSISTANT: Sure, on which days do you want to tavel IAD location?

USER: I would like to travel on 04/21 and 04/23.

ASSISTANT: Ok, wait for a minute please.

USER: Sure, I will be waiting for your response.

ASSISTANT: Sorry Martin, no flight found based on your travelling dates.

USER: That is not a problem. I will find another way to reach there.

ASSISTANT: Ok, thank you for reaching us.

USER: Thank you for your help.