You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Edward Gonzalez.

ASSISTANT: How can I help you today?

USER: Can you help me in booking from LGA to IAD, as there is a musical concert at Washington?

ASSISTANT: Sure, may I know your journey dates please?

USER: My trip dates are 05/05 to 05/07.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: I am sorry to inform you that there is no flight available at your requested dates.

USER: No issue, thank you.

ASSISTANT: Most welcome.