You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I would like to travel TX - DFW from DC - IAD. Can you help me to book my flight ticket?

ASSISTANT: Sure, may I know your preferable dates?

USER: My travelling dates are 05/20 and 05/22.

ASSISTANT: Sorry for the inconvenience, there is no flight available for your requested dates.

USER: It's ok I will go with another way for the journey.

ASSISTANT: May I know your good name please?

USER: Myself Donald Rodriguez.

ASSISTANT: Thank you for approaching us.

USER: Thank you for the information.