You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Janet Lopez here.

ASSISTANT: How can I serve you?

USER: I am planning to reserve my ticket from SFO to DCA. Can you please help me with booking a flight ticket?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My planned travel dates are June 15 and June 17.

ASSISTANT: Please share me your specifications.

USER: I want to book my ticket in economy class and my return time is morning.

ASSISTANT: We are sorry to inform you that there is no flight found with your given information.

USER: Not an issue, anyway thank you for the information.

ASSISTANT: Thank you.