You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What would I do for you?

USER: My name is Shirley King. I am planning to travel from IAD to EWR for a business meeting, can you please help me with booking a flight ticket?

ASSISTANT: Yes, I will help you about it.May I know your travelling dates?

USER: My travelling dates are 10/22 and 10/24.

ASSISTANT: Sorry to say this Shirley King, there is no flight which matches your travelling dates.

USER: That's ok. Thank you for the information.

ASSISTANT: It's my pleasure.Thank you so much for reaching us.

USER: You are welcome.