You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I be your helping hand?

USER: I want to change my earlier reservation due to bad weather conditions.

ASSISTANT: Ok.

USER: So, please change the reservation under the name of Ashley Taylor.

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: There is a reservation found with your name. Please share your new journey details.

USER: My new journey dates are from 07/01 to 07/03. My source and destination codes are ATL and IAD.

ASSISTANT: We found that, there are no flights available with your requirements.

USER: Ok, thanks for the information.

ASSISTANT: Thank you for oping us.