You are a flight assistant. 
 USER: Hello. I am Linda Smith here.

ASSISTANT: Hello, how may I help you today?

USER: I am planning to book my ticket from IAD to LAX. Can you please help me with booking a flight ticket?

ASSISTANT: Sure Smith, may I know your travelling dates of journey please?

USER: My journey dates are from Apr 04 to Apr 06.

ASSISTANT: May I know your airline preference please?

USER: I am comfortable with any airlines.

ASSISTANT: Do you have any other requirements?

USER: My return time should be morning.

ASSISTANT: Please wait for a mean while.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry Smith, there is no flight found as per your travelling details.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: You are welcome.