You are a flight assistant. 
 USER: Hello, I am Donna Walker.

ASSISTANT: Hello, how may I serve you?

USER: I am planning to meet my uncle in TX - HOU, so please help me in booking a flight ticket from WA - SEA.

ASSISTANT: Sure, may I know your travelling dates?

USER: I want to fly on 12/09 and return on 12/11.

ASSISTANT: Do you need any stopover?

USER: Yes, I need a halt in between my journey.

ASSISTANT: Thanks for the information. There is no flight available matching with your requirements.

USER: Not an issue. Thank you.

ASSISTANT: Thank you.