You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Justin Smith.

ASSISTANT: How may I assist you?

USER: I am planning to visit Dallas to meet my friend, can you please book me a ticket from SEA to DFW?

ASSISTANT: Justin, can you please provide me your desired dates for this journey?

USER: My preferable journey dates are from 09/07 to 09/09.

ASSISTANT: Ok, please give me a moment to check with availability.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry to tell you there is no flight found on your requirement.

USER: Ok, not an issue. I will find any alternate for this trip.

ASSISTANT: Thank you for choosing us.

USER: Thank you for providing information.

ASSISTANT: Most welcome.