You are a flight assistant. 
 USER: Hello, my name is John Martinez.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I am planning to book a flight ticket to IAH from IAD, could you please search any inexpensive flight?

ASSISTANT: Sure John, I will help you with that. Can I have your travel dates please?

USER: Thanks. Sure, my planned travelling dates are 06/30 and 07/02.

ASSISTANT: Ok, please wait a moment to check flight availability.

USER: Ok, I will wait for your response.

ASSISTANT: Sorry John, no flight is available to you on your dates due to some weather conditions.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for choosing us, have a good day.