You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Samantha Lee.

ASSISTANT: How may I help you?

USER: I am planning to visit Dallas, can you please book me a ticket from ORD to DFW?

ASSISTANT: Sure, please provide me your travel dates.

USER: I am planning my journey on the dates of June 09 and June 11.

ASSISTANT: Ok, please let me know your specifications.

USER: I prefer to depart in the afternoon time.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there is no flight available on your preferred travel dates.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: You are welcome and thank you for contacting us.